Much work in the acquisition of syntax and morphology has focused on cross-linguistic differences and/or cross-linguistic influence in two or more typologicallydistinct languages. Acquisition scenarios and comparative studies of typologically similar languages are a comparatively under-researched area, although they raise a number of questions, which have, so far, not been answered or not even been addressed:

How does the acquisition of two typologically similar languages or varieties differ from the acquisition of two typologically distinct languages?

Does typological similarity facilitate or inhibit acquisition?

In which developmental stage or at what proficiency level is facilitation or inhibition expected to occur?

Which (additional) methodological challenges does research on typologically similar languages pose?

The aim of this workshop is to bring together formally-oriented research in the acquisition of syntax and morpho-syntax of two typologically similar languages (e.g. Spanish and Italian or Danish and German) or varieties (e.g. Venetian and standard Italian). We invite contributions concerning all kinds of acquisition scenarios, such as simultaneous bilingualism, early L2 acquisition, adult L2 acquisition, L3 acquisition, and language attrition. Papers dealing with the early bilingual acquisition of mutually understandable languages (or varieties of one language) and L3 acquisition are especially welcome.